EP3996889A2 - Verfahren zur herstellung eines teils aus einem verbundmaterial durch injektion einer gefüllten schlämme in eine faserige textur - Google Patents

Verfahren zur herstellung eines teils aus einem verbundmaterial durch injektion einer gefüllten schlämme in eine faserige textur

Info

Publication number
EP3996889A2
EP3996889A2 EP20746253.2A EP20746253A EP3996889A2 EP 3996889 A2 EP3996889 A2 EP 3996889A2 EP 20746253 A EP20746253 A EP 20746253A EP 3996889 A2 EP3996889 A2 EP 3996889A2
Authority
EP
European Patent Office
Prior art keywords
slip
injection
mold
capsule
blank
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP20746253.2A
Other languages
English (en)
French (fr)
Other versions
EP3996889B1 (de
Inventor
Nicolas DROZ
Célia Iglesias Cano
Philippe Charles Alain Le Biez
Ludovic Philippe LIAIS
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Safran Aircraft Engines SAS
Original Assignee
Safran Aircraft Engines SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from FR1907815A external-priority patent/FR3098433B1/fr
Priority claimed from FR1907816A external-priority patent/FR3098434B1/fr
Application filed by Safran Aircraft Engines SAS filed Critical Safran Aircraft Engines SAS
Publication of EP3996889A2 publication Critical patent/EP3996889A2/de
Application granted granted Critical
Publication of EP3996889B1 publication Critical patent/EP3996889B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/26—Producing shaped prefabricated articles from the material by slip-casting, i.e. by casting a suspension or dispersion of the material in a liquid-absorbent or porous mould, the liquid being allowed to soak into or pass through the walls of the mould; Moulds therefor ; specially for manufacturing articles starting from a ceramic slip; Moulds therefor
    • B28B1/261—Moulds therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/26—Producing shaped prefabricated articles from the material by slip-casting, i.e. by casting a suspension or dispersion of the material in a liquid-absorbent or porous mould, the liquid being allowed to soak into or pass through the walls of the mould; Moulds therefor ; specially for manufacturing articles starting from a ceramic slip; Moulds therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/24—Producing shaped prefabricated articles from the material by injection moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/26—Producing shaped prefabricated articles from the material by slip-casting, i.e. by casting a suspension or dispersion of the material in a liquid-absorbent or porous mould, the liquid being allowed to soak into or pass through the walls of the mould; Moulds therefor ; specially for manufacturing articles starting from a ceramic slip; Moulds therefor
    • B28B1/261—Moulds therefor
    • B28B1/262—Mould materials; Manufacture of moulds or parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
    • B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
    • B28B11/243—Setting, e.g. drying, dehydrating or firing ceramic articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
    • B28B13/04—Discharging the shaped articles
    • B28B13/06—Removing the shaped articles from moulds
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    • B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
    • B28B23/0006—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects the reinforcement consisting of aligned, non-metal reinforcing elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/34—Moulds, cores, or mandrels of special material, e.g. destructible materials
    • B28B7/342—Moulds, cores, or mandrels of special material, e.g. destructible materials which are at least partially destroyed, e.g. broken, molten, before demoulding; Moulding surfaces or spaces shaped by, or in, the ground, or sand or soil, whether bound or not; Cores consisting at least mainly of sand or soil, whether bound or not
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    • B28B7/34—Moulds, cores, or mandrels of special material, e.g. destructible materials
    • B28B7/348—Moulds, cores, or mandrels of special material, e.g. destructible materials of plastic material or rubber
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/52—Constituents or additives characterised by their shapes
    • C04B2235/5208—Fibers
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    • C04B2235/524—Non-oxidic, e.g. borides, carbides, silicides or nitrides
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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    • C04B2235/524—Non-oxidic, e.g. borides, carbides, silicides or nitrides
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/52—Constituents or additives characterised by their shapes
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/52—Constituents or additives characterised by their shapes
    • C04B2235/5208—Fibers
    • C04B2235/5252—Fibers having a specific pre-form
    • C04B2235/5256—Two-dimensional, e.g. woven structures
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    • C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
    • C04B2235/602—Making the green bodies or pre-forms by moulding
    • C04B2235/6022—Injection moulding
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    • C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
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    • C04B2235/6027—Slip casting
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    • C04B2235/606—Drying
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
    • C04B2235/6562—Heating rate
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    • C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
    • C04B2235/6567—Treatment time
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/66—Specific sintering techniques, e.g. centrifugal sintering
    • C04B2235/661—Multi-step sintering

Definitions

  • the present invention relates to the manufacture of parts from a slurry loaded with particles and in particular parts made of ceramic, of abradable material or of thermostructural composite material, in particular of the type
  • CMC ceramic matrix
  • these can be produced by a liquid process which comprises a step of impregnating a fibrous texture with a loaded slip, for example with alumina particles in the case of of an oxide / oxide composite material or of silicon carbide (SiC) particles in the case of a CMC composite material.
  • the liquid phase of the slip must be drained or filtered in order to obtain optimum filling of the residual porosities present in the fibrous texture with the solid fillers.
  • Document WO 2017/060601 describes the use of a mold made of porous material comprising a molding cavity containing a fibrous texture into which is injected a slip loaded with refractory solid particles.
  • the mold of porous material makes it possible to eliminate the liquid phase of the slip introduced into the fibrous texture while retaining the refractory solid particles in the molding cavity.
  • the mold of porous material is held inside an enclosure of rigid material during the injection under pressure of the slip.
  • a supply channel is drilled in the porous mold as well as in the porous medium possibly present between the mold and the rigid enclosure.
  • a mold of porous material of the type described above is used to remove the liquid phase in order to retain the solid particles in the molding cavity thereof and obtain then a blank made up of all or part of these particles.
  • the object of the present invention is to remedy the aforementioned drawbacks and to provide a solution which makes it possible to reduce the risks of damage to the part blank and to the mold made of porous material during the release of the blank after injection and filtration of a slip loaded into the mold cavity.
  • the invention provides a method of manufacturing a part comprising the following steps:
  • the injection tool comprising a mold of porous material comprising a molding cavity, an enclosure of rigid material in which the mold of porous material is held, the enclosure further comprising at least one injection port, at least one discharge vent and at least one injection channel connecting said at least one injection port to the molding cavity of the porous mold for injecting the slip into the molding cavity, characterized in that the tooling d
  • the injection comprises a sacrificial capsule, the sacrificial capsule being placed in the molding cavity, said capsule being made of porous material.
  • the method further comprises the following steps:
  • the method further comprises placing glass beads in the mold cavity before the injection under pressure of the slip.
  • the sacrificial capsule is made with a porous material identical to the porous material of the mold.
  • the sacrificial capsule is made of one of the following materials: porous resin,
  • the sacrificial capsule has a wall thickness of between 1 mm and 30 mm.
  • the sacrificial capsule comprises a first and a second part assembled with one another, the first part comprising a first imprint corresponding to a part of the shape of the part to be manufactured. , the second part comprising a second imprint corresponding to the other part of the shape of the part to be manufactured.
  • the heat treatment of the blank comprises a first stage carried out at a temperature between 40 ° C and 95 ° C so as to dry the liquid of the slip present in the sacrificial capsule and a second bearing carried out at a temperature between 1000 ° C and 1100 ° C so as to bind particles together and form a part from the blank.
  • the first level is carried out according to a following a gentle rise ramp of between 1 ° C / min and 6 ° Qhn to reach a temperature of between 40 ° C and 95 ° C maintained for a period of between 30 min and 90 minutes.
  • the heat treatment further comprises a third stage carried out after the first stage and before the second stage, the third stage being carried out at a temperature between 450 ° C and 600 ° C of way to burn in sacrificial capsule.
  • the third level is achieved according to a gentle rise ramp of between 1 ° C / min and 7 ° C / min to extinguish a temperature between 450 ° C and 600 ° C maintained over a period of between 30 min and 4 h.
  • the yarns of the texture can be yarns formed from fibers made up of one or more of the following materials: alumina, mullite, silica, an aluminosilicate, a borosilicate, silicon carbide and carbon.
  • the refractory ceramic particles can be made of a material chosen from: alumina, mullite, silica, an aluminosilicate, an aluminophosphate, zirconia, a carbide, a boride, a silicide and a nitride, or a mixture of several of these materials.
  • Figure 1 is a schematic exploded perspective view of an injection tool in accordance with one embodiment of the invention.
  • Figure 2 is a schematic sectional view showing the tool of Figure 1 closed with a fibrous texture positioned therein,
  • Figure 3 is a schematic sectional view showing the impregnation of a fibrous texture with a slip loaded in the tooling of Figure 2.
  • the invention generally applies to the manufacture of parts produced by injection of a slip loaded with particles into a mold capable of draining or filtering the liquid phase of the slip so as to retain the particles which then constitute all or part of the room.
  • the tooling of the invention can be used to manufacture monolithic ceramic parts, parts or coatings in abradable material and parts in thermostructural composite material, in particular of the Oxide / Oxide type or with a ceramic matrix (CMC). .
  • the method of manufacturing a part made of composite material, in particular of the oxide / oxide or CMC type in accordance with the present invention begins with the production of a fibrous texture intended to form the reinforcement of the part.
  • the method of manufacturing a part made of composite material, in particular of the oxide / oxide or CMC type in accordance with the present invention begins with the production of a fibrous texture intended to form the reinforcement of the part.
  • the fibrous structure is produced in a known manner by weaving by means of a loom of the jacquard type on which a bundle of warp threads or strands has been placed in a plurality of layers, the warp threads being linked by threads of weft or vice versa.
  • the fibrous texture can be produced by stacking layers or plies obtained by two-dimensional (2D) weaving.
  • the fiber texture can also be produced directly in one piece by three-dimensional (3D) weaving.
  • Two-dimensional weaving is understood here to mean a conventional weaving method by which each weft yarn passes from one side of the yarns of a single layer of warp to the other or vice versa.
  • the method of the invention is particularly suitable for allowing the introduction of a loaded slip into 2D fiber textures, namely textures obtained by stacking 2D layers or plies, of considerable thickness, that is to say 2D fibrous structures having a thickness of at least 0.5 mm, preferably at least 1 mm.
  • three-dimensional weaving or “3D weaving” or even “multilayer weaving” is meant here a weaving method by which at least some of the weft threads bind warp threads on several layers of warp threads or vice versa following a weaving. corresponding to a weaving weave which can in particular be chosen from one of the following weaves: interlock, multi-canvas, multi-satin and multi-twill.
  • the yarns used to weave the fibrous texture intended to form the fibrous reinforcement of the part made of composite material can in particular be formed of fibers.
  • alumina Made from any of the following materials: alumina, mullite, silica, a
  • aluminosilicate a borosilicate, silicon carbide, carbon or a mixture of several of these materials.
  • a fibrous texture 10 is placed in an injection tool 100.
  • the fibrous texture 10 is produced according to one of the techniques defined above (stacking 2D layers or 3D weaving) with Nextel 610TM alumina threads.
  • the fibrous texture 10 is here intended to form the fibrous reinforcement of a blade made of an oxide / oxide composite material.
  • the tool 100 comprises a mold of porous material 110 formed in two parts 1 1 1 and 1 12.
  • the two parts 1 1 1 and 1 12 define a mold cavity 1 13 ( Figure 2) when they are assembled one against the other, cavity in which the fibrous texture is intended to be placed.
  • the two parts 1 1 1 and 1 12 are used to
  • part 1 11 of the mold of porous material 1 10 comprises an injection channel 1 1 1 1 for the injection of a slip loaded into the fiber texture as explained below in detail.
  • the injection channel 1 11 1 is produced, for example by drilling, in the porous material of the mold 1 10.
  • the injection tool 100 also includes an enclosure made of rigid material 130 in which the mold of porous material 110 is held.
  • the enclosure 130 comprises a bottom 131, a side wall 132 integral with the bottom 131 and a cover 133.
  • the enclosure 130 can be made with any type of material having sufficient rigidity to withstand the injection pressures of the slip and the pumping (vacuum draw) for the evacuation of the liquid phase thereof.
  • the enclosure may in particular be made of a metallic or plastic material.
  • the cover 133 comprises an injection port 134 through which the slip is intended to be injected in order to penetrate into the porosity of the fibrous texture 10.
  • the slip is intended to be injected. through an injection port 134 opening into the molding cavity 1 13.
  • the enclosure 130 comprises a single vent 135 for evacuating the liquid medium from the slip, present here on the side wall 132 in the vicinity of the bottom 131.
  • a single vent 135 for evacuating the liquid medium from the slip, present here on the side wall 132 in the vicinity of the bottom 131.
  • the mold of porous material 110 has a size smaller than the internal volume of the enclosure made of metallic material 130.
  • the volume present between the mold of porous material and the enclosure of rigid material is filled with a porous medium 120 in order to allow the circulation and evacuation of the liquid phase of the slip.
  • the porous medium 120 can consist in particular of sand, a foam, or a granular material.
  • any type of foam, rigid or flexible, which has a network of porosity allowing the passage of the liquid medium of the slip can be used as porous medium.
  • any type of granular material having a stacking rate compatible with the passage of the liquid phase of the slip can be used as porous medium.
  • the porous medium 120 has a channel injection 121 in communication with both the injection port 134 of the enclosure 130 and the injection channel 11 1 1 of the mold of porous material 1 10 in order to allow the injection of the slip into the fibrous texture 10.
  • the injection channel 121 is made, for example by drilling, in the porous material of the medium 120. In the example described here, the injection channels 121 and 11 1 1 form the supply circuit in the tool. injection 100 for the injection of the loaded slip.
  • the volume of void present in the porous medium is preferably greater than the quantity or volume of the liquid phase of the slip which must be injected into the fibrous texture. This allows all of the liquid phase to be evacuated from the walls of the porous mold when a vacuum is drawn at the level of the discharge vent (s) and / or when pressure is applied in the injection port. .
  • the mold of porous material has external dimensions equivalent to the internal volume of the enclosure so that the mold of porous material is directly in contact with the internal walls of the enclosure.
  • the feed circuit in the injection tool for the injection of the loaded slip consists only of the injection channel made in the mold of porous material (no porous medium).
  • a sacrificial capsule 160 is interposed between the fibrous texture 10 and the mold of porous material 110. More precisely, as illustrated in FIG. 1, a sacrificial capsule 160 here consists of two half-shells 161 and 162. between which the fibrous texture is placed before its introduction into the mold of porous material 1 10. The half-shells 161 and 162 each comprise respectively an imprint 1610 and an imprint 1620.
  • the indentations 1610 and 1620 define an internal volume 163 ( Figure 2) when the two half-shells 161 and 162 are assembled against each other, the internal volume in which the fibrous texture 10 is maintained.
  • the imprints 1610 and 1620 have a shape corresponding to the shape of the part to be manufactured from the fiber texture.
  • the two half-shells 161 and 162 are used to size the preform and therefore the part to be obtained as well as to adjust the rate of fibers in the part when closing the mold of porous material 1 10.
  • the sacrificial capsule 160 is made of a porous material. She may be
  • the half-shells 161 and 162 of the capsule 160 are themselves produced by molding by injecting and polymerizing a resin between a mold and a counter-mold, the mold having a shape corresponding to the indentations 1610 and 1620 of the half-shells 161 and
  • the characteristics of the porous network of the sacrificial capsule in particular in terms of pore size and rate of porosity, can be controlled by adjusting the polymerization cycle (s) depending on the nature of the resin used. There are, therefore, as many choices of porosity networks as there are porous resins available.
  • the following porous resins can be used for the production of the sacrificial capsule:
  • the sacrificial capsule 160 can also be made from a rigid porous material such as microporous polytetrafluoroethylene (PTFE) such as the “microporous PTFE” products sold by the company. Porex®.
  • PTFE microporous polytetrafluoroethylene
  • the impressions 1610 and 1620 are each made respectively by thermoforming or machining the porous material.
  • the mold of porous material is preferably made with the same porous material used to make the sacrificial capsule, for example one of the porous materials mentioned above.
  • the assembly of sacrificial capsule 160 and mold of porous material 1 10 allows the drainage of the liquid medium of the slip outside the fibrous texture 10 and its evacuation through the vent 135 due to the application of a gradient of pressure between the vent 135 and the injection port 134.
  • the average size of the pores (D50) of the capsule and of the mold of porous material may for example be between 1 ⁇ m and 10 ⁇ m.
  • the half-shell 161 of the sacrificial capsule 160 comprises an external surface 1611 while the half-shell itself comprises an external surface 1622. According to a particular characteristic of the invention, the external surfaces 161 1 and 1622 have a planar geometry. as illustrated in Figure 1.
  • the internal surfaces 1 110 and 1120 respectively of the two parts 1 1 1 and 1 12 of the mold 110 in which the half-shells 161 and 162 are housed respectively also have a planar geometry as illustrated in FIG. 1.
  • the external surfaces 161 1 and 1622 have a geometry corresponding respectively to that of the
  • the internal surfaces 1 110 and 1120 respectively of the two parts 1 1 1 1 and 1 12 of the mold 1 10 in which the half-shells 161 and 162 are housed respectively also have a geometry corresponding respectively to that of the indentations 1610 and 1620 of the two half-shells 161 and 162.
  • the wall thickness of the sacrificial capsule 160 is made as thin as possible in order to avoid excessive combustion of the capsule during the heat treatment.
  • the wall thickness of the sacrificial capsule is determined based on the size and geometry of the part to be manufactured. In other words, the wall thickness of the sacrificial capsule is determined to be as thin as possible while being able to take up the compaction forces when they are applied and the pressurizing forces during the filtration of the gas. slip.
  • the sacrificial capsule has a wall thickness of preferably between 1 mm and 30 mm.
  • the fibrous texture 10 is first placed in the sacrificial capsule 160.
  • the capsule containing the fibrous texture is then placed in the porous material mold 110 of the injection tool 100 as illustrated in Figures 1 and 2.
  • FIG. 3 illustrates the configuration obtained during the injection of a slip 150 and the drainage of the medium or liquid phase thereof.
  • a vacuum was carried out within the mold of porous material in order then to fill the fibrous texture as much as possible with the slip.
  • the evacuation can be achieved by pumping at the exhaust vent 135.
  • the slip 150 is injected under pressure through the injection port 134 and transported to the fibrous texture 10 by the injection channels 121 and 1 1 1 1 so as to penetrate into the fibrous texture 10.
  • the refractory particles 1500 present in the slip 150 are intended to allow the formation of a refractory ceramic matrix in the porosity of the fibrous texture 10.
  • This refractory ceramic matrix may, in an exemplary embodiment, be a refractory oxide matrix.
  • the slip may for example be a suspension of alumina powder in water.
  • the alumina powder used can be alpha alumina powder
  • the slip may be a suspension comprising refractory ceramic particles having an average particle size of between 0.1 ⁇ m and 10 ⁇ m.
  • the volume content of refractory ceramic particles in the slip may, before injection, be between 15% and 40%.
  • the refractory ceramic particles can include a material chosen from: alumina, mullite, silica, aluminosilicates, aluminophosphates, carbides, borides, nitrides and mixtures of such materials.
  • the refractory ceramic particles can furthermore be mixed with particles of alumina, zirconia, aluminosilicate, rare earth oxide, rare earth silicate (which can for example example be used in environmental or thermal barriers) or any other filler making it possible to functionalize the part made of composite material to be obtained such as carbon black, graphite or silicon carbide.
  • the medium or liquid phase of the slip may, for example, comprise an aqueous phase having an acidic pH (i.e. a pH less than 7) and / or an alcoholic phase comprising, for example, ethanol.
  • the slip may comprise an acidifier such as nitric acid and the pH of the liquid medium may for example be between 1, 5 and 4.
  • the slip may, in addition, comprise an organic binder such as polyvinyl alcohol (PVA ) which is especially soluble in water.
  • PVA polyvinyl alcohol
  • the refractory ceramic particles 1500 are present in the porosity of the fibrous texture 10.
  • the arrows 1501 represent the movement of the medium or liquid phase of the. slip drained both by sacrificial capsule 160 and by the mold of porous material 1 10.
  • Pumping P can furthermore be carried out at the outlet vent 135 during drainage, for example by means of a primary vacuum pump. Performing such pumping improves drainage and dries the fibrous texture more quickly.
  • the sacrificial capsule 160 and the mold of porous material 1 10 make it possible to retain in the fibrous texture 10 the refractory ceramic particles 1500 initially present in the slip and that all or part of these particles are deposited by filtration in the fibrous texture. 10.
  • the medium or liquid phase 1501 of the slip can be drained out of the fibrous texture 10 in all directions, the medium or liquid phase 1501 then circulating. in the porous medium 120 up to the vent 135 through which it is evacuated out of the injection tool 100.
  • This drainage of the liquid medium in all directions makes it possible to promote a homogeneous and dense sedimentation deposit of the refractory ceramic particles 1500 in the fiber texture 10 and therefore obtain a high matrix volume ratio in the final part.
  • the sacrificial capsule 160 and the mold of porous material 110 being held in an enclosure made of rigid material 130, the latter can withstand the injection pressures of the slip loaded into the texture as well as those exerted by the pumping for the evacuation of the liquid medium from the slip.
  • a blank corresponding here to a fiber preform 15 loaded with refractory ceramic particles for example refractory ceramic oxide particles or alumina, is obtained.
  • the blank still protected inside the sacrificial capsule, is then demolded, the demolding of the preform being facilitated by the presence of the capsule.
  • no mechanical demolding force is exerted directly on the preform, which makes it possible to avoid any damage and / or deformation of the preform and, consequently, of the part. final.
  • the blank retains its integrity and the shape adopted in the mold cavity after demoulding.
  • the blank and the capsule are then subjected to a heat treatment comprising at least the following two stages:
  • a third level can also be achieved after the first level and before the second level in order to decouple the elimination of the sacrificial capsule from the sintering or bonding of the refractory ceramic particles.
  • This third level is carried out according to a gentle rise ramp of between 1 ° C / min and 7 ° C / min to reach a temperature between 450 ° C and 000 ° C maintained over a period of between 30 min and 4 h, this third level to burn the sacrificial capsule,
  • a part of composite material is then obtained, for example a part of oxide / oxide composite material, provided with a fibrous reinforcement formed by the fibrous preform and having a high matrix volume ratio with a homogeneous distribution of the refractory ceramic matrix throughout. the fibrous reinforcement.
  • a part made of CMC composite material other than Oxide / Oxide can be obtained in the same way by producing the fiber texture with silicon carbide and / or carbon fibers and by using a slip loaded with carbide particles (for example SiC ), boride (for example of TiB 2 ) or nitride (for example of Si 3 N 4 ).
  • carbide particles for example SiC
  • boride for example of TiB 2
  • nitride for example of Si 3 N 4
  • the sacrificial capsule is empty before the injection of the slip.
  • the blank and the capsule are subjected to a heat treatment as explained above in order to obtain the final part.
  • beads for example made of glass, are placed in the sacrificial capsule before the injection of the loaded slip.
  • the capsule and the blank consisting of the balls and the particles supplied by the slip are subjected to a heat treatment as explained above to form the part or the final abradable coating.

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EP20746253.2A 2019-07-11 2020-06-30 Verfahren zur herstellung eines teils aus einem verbundmaterial durch injektion einer gefüllten schlämme in eine faserige textur Active EP3996889B1 (de)

Applications Claiming Priority (3)

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FR1907815A FR3098433B1 (fr) 2019-07-11 2019-07-11 Procédé de fabrication d’une pièce en matériau composite par injection d’une barbotine chargée dans une texture fibreuse
FR1907816A FR3098434B1 (fr) 2019-07-11 2019-07-11 Outillage pour l’injection d’une barbotine chargée
PCT/FR2020/051139 WO2021005282A2 (fr) 2019-07-11 2020-06-30 Procede de fabrication d'une piece en materiau composite par injection d'une barbotine chargee dans une texture fibreuse

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EP3996889A2 true EP3996889A2 (de) 2022-05-18
EP3996889B1 EP3996889B1 (de) 2024-01-10

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US12017379B2 (en) 2021-12-20 2024-06-25 Rtx Corporation Ribbonized tows for optimized improved composite performance

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JPH01210306A (ja) * 1988-02-19 1989-08-23 Sintokogio Ltd スラリー状材料成形用型およびその製造方法
DE3805193A1 (de) * 1988-02-19 1989-08-31 Nmi Naturwissenschaftl U Mediz Verfahren zur herstellung von hochfesten keramik-fasern und -formkoerpern und ihre verwendung
FR2846034B1 (fr) * 2002-10-22 2006-06-23 Snecma Moteurs Carter, compresseur, turbine et turbomoteur a combustion comprenant un tel carter
CN1759139A (zh) * 2003-03-12 2006-04-12 佩特里特公司 结构和其它复合材料及其制造方法
FR2858611B1 (fr) * 2003-08-07 2006-11-24 Saint Gobain Ct Recherches Procede de fabrication d'une piece en silice amorphe frittee, moule et barbotine mis en oeuvre dans ce procede
FR2887890B1 (fr) * 2005-06-30 2007-10-12 Snecma Composition de materiau abradable, piece thermomecanique ou carter comprenant un revetement et procede de fabrication ou de reparation d'un revetement presentant cette composition
CN102745977B (zh) * 2012-07-25 2014-07-02 武汉理工大学 一种快速制备高致密度氧化镁纳米陶瓷的方法
WO2016064430A1 (en) * 2014-10-20 2016-04-28 Intellectual Property Holdings, Llc Ceramic preform and method
FR3030505B1 (fr) * 2014-12-23 2019-07-12 Safran Procede de fabrication d'une preforme fibreuse chargee de particules ceramiques refractaires
CN104760118A (zh) * 2015-04-20 2015-07-08 中国船舶重工集团公司第七二五研究所 一种消除压力注浆成型时ito坯体中间夹层的方法
FR3041631B1 (fr) * 2015-09-24 2022-01-07 Snecma Materiau poreux en ceramique pour revetement d'une piece et procede de fabrication de ce materiau
FR3041890B1 (fr) 2015-10-05 2017-11-24 Snecma Procede de fabrication d'une piece en materiau composite par injection d'une barbotine chargee dans un moule poreux
FR3050454B1 (fr) * 2016-04-25 2019-07-12 Safran Procede de fabrication d'une piece en materiau composite par injection d'une barbotine chargee dans une texture fibreuse

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WO2021005282A2 (fr) 2021-01-14
CN114080311B (zh) 2024-04-12
US20220281134A1 (en) 2022-09-08
CN114080311A (zh) 2022-02-22
WO2021005282A3 (fr) 2021-03-25
EP3996889B1 (de) 2024-01-10

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